General Knowledge - Physics

Exercise :: Physics - Section 1

  • Physics - Section 1
25. 

Lux is the SI unit of

A. intensity of illumination
B. luminous efficiency
C. luminous flux
D. luminous intensity

Answer: Option A

Explanation:

The SI unit of intensity of illumination (illuminance) is the lux. An illuminance of 1.0 lux is produced by 1.0 lumen of light shining on an area of 1.0 m^2.

26. 

On a rainy day, small oil films on water show brilliant colours. This is due to

A. dispersion
B. interference
C. diffraction
D. polarization

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

27. 

Point A is at a lower electrical potential than point B. An electron between them on the line joining them will

A. move towards A
B. move towards B
C. move at right angles to the line joining A and B
D. remain at rest

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

28. 

Materials for rain-proof coats and tents owe their water-proof properties to

A. surface tension
B. viscosity
C. specific gravity
D. elasticity

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

29. 

RADAR is used for

A. locating submerged submarines
B. receiving a signals in a radio receiver
C. locating geostationary satellites
D. detecting and locating the position of objects such as aeroplanes

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

30. 

Sound of frequency below 20 Hz is called

A. audio sounds
B. infrasonic
C. ultrasonic
D. supersonics

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.